Bl420mru Drive Chain Black 420 X 130

Mru features rk’s proprietary ultra thin seal, u-rings, where the thickness of the seal is less than 50% of the most common o-ring seal.This allows rk to design a sealed chain with the weight of a non-sealed chain.Mru will feature 4 times longer chain life than comparable non-sealed 420 chains and will require less chain adjustments compared to non-sealed 420 chains.